• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권12호
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• pp.5723-5743
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• 2018

The evolving internet-based services demand high-speed data transmission in conjunction with scalability. The next generation optical network has to exploit artificial intelligence and cognitive techniques to cope with the emerging requirements. This work proposes a novel way to solve the dynamic provisioning problem in optical network. The provisioning in optical network involves the computation of routes and the reservation of wavelenghs (Routing and Wavelength assignment-RWA). This is an extensively studied multi-objective optimization problem and its complexity is known to be NP-Complete. As the exact algorithms incurs more running time, the heuristic based approaches have been widely preferred to solve this problem. Recently the software-defined networking has impacted the way the optical pipes are configured and monitored. This work proposes the dynamic selection of path computation algorithms in response to the changing service requirements and network scenarios. A software-defined controller mechanism with a novel packet matching feature was proposed to dynamically match the traffic demands with the appropriate algorithm. A software-defined controller with Path Computation Element-PCE was created in the ONOS tool. A simulation study was performed with the case study of dynamic path establishment in ONOS-Open Network Operating System based software defined controller environment. A java based NOX controller was configured with a parent path computation element. The child path computation elements were configured with different path computation algorithms under the control of the parent path computation element. The use case of dynamic bulk path creation was considered. The algorithm selection method is compared with the existing single algorithm based method and the results are analyzed.

• 대한공간정보학회지
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• 제19권3호
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• pp.67-74
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• 2011

최근 들어 스마트폰 등 모바일 단말기의 활용이 증대되면서 이동 중인 보행자에게 길안내 서비스를 제공하는 보행자 내비게이션 서비스의 필요성이 증가하고 있다. 이러한 내비게이션 서비스에서 도로 네트워크는 경로와 안내 정보를 생성하는데 있어 가장 핵심적인 요소이다. 하지만, 차량을 위한 도로 네트워크에 비하여 보행 네트워크는 더욱 상세하고 방대한 공간에 대한 모델링 기법이 요구된다. 따라서 기존에 현지 조사와 수동 편집 과정을 통하여 구축하는 방법보다 효율적인 방안이 요구된다. 따라서 본 연구에서는 기 구축되어 있는 차량용 내비게이션 데이터를 기반으로 보행자에게 적합한 보행 네트워크 생성 기법을 제안하였다. 보행 네트워크는 실제 보행자의 이동과 유사한 경로를 생성하기 위하여 보행 공간을 그 특성에 따라 보행 링크(인도, 이면도로, 보행 시설물)와 오픈 스페이스 링크로 구분하고 서로 다른 방법을 적용하여 구축하였다. 이와 같은 기법은 보행 네트워크 생성에 관한 표준 및 방법론이 존재하지 않는 현 시점에서 하나의 효율적인 대안으로 활용될 수 있을 것으로 판단된다.

• Computers and Concrete
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• 제12권3호
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• pp.261-283
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• 2013

This paper aims to contribute to the three-dimensional generalization of numerical prediction of crack propagation through the formulation of finite elements with embedded discontinuities. The analysis of crack propagation in two-dimensional problems yields lines of discontinuity that can be tracked in a relatively simple way through the sequential construction of straight line segments oriented according to the direction of failure within each finite element in the solid. In three-dimensional analysis, the construction of the discontinuity path is more complex because it requires the creation of plane surfaces within each element, which must be continuous between the elements. In the method proposed by Chaves (2003) the crack is determined by solving a problem analogous to the heat conduction problem, established from local failure orientations, based on the stress state of the mechanical problem. To minimize the computational effort, in this paper a new strategy is proposed whereby the analysis for tracking the discontinuity path is restricted to the domain formed by some elements near the crack surface that develops along the loading process. The proposed methodology is validated by performing three-dimensional analyses of basic problems of experimental fractures and comparing their results with those reported in the literature.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.716-721
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• 2004

Several Solid Freeform Fabrication Systems(SFFS) are commercialized in a few companies for rapid prototyping. However, they have many technical problems including the limitation of applicable materials. A new method of speedy prototyping is required for the recent manufacturing environments of multi-item and small quantity production. The objectives of this paper include the development of a novel method of SFFS, the ${CAFL}^{VM}$(Computer Aided Fabrication of Lamination for Various Material), and the manufacture of the various material samples for the certification of the proposed system and the creation of new application areas. For these objectives, the technologies for a highly accurate robot path control, the optimization of support structure, CAD modeling, adaptive slicing was implemented. In this paper, we design an algorithm that the cutting path of a laser beam which is controlled with constant speed. The laser beam is tangentially controlled in order to solve the inaccuracy of a 3D model surface. The designed algorithm for constant-speed path control and tangent-cutting control is implemented and experimented in the ${CAFL}^{VM}$ system.

• International journal of advanced smart convergence
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• 제9권3호
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• pp.153-160
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• 2020

This research aims to provide empirical basic data for the development of local communities through the establishment of efficient strategies for the formation of positive relations between the club and the region through the Creation of Shared Value (CSV) activities. We come up with the results of this study to show that CSV, social problem orientation, and core competency utilization affect the team trust of local community, and that CSV, long-term orientation, social problem orientation and core competency utilization affect community identification. The research should enhance the value of professional sports teams that promote their own path to self-sustaining as a single independent business area, and identify their trust through CSV activities for co-prosperity with their local communities, and thus their relationship with the community. Therefore, various strategies and efforts will ultimately increase the team trust and community identity of local residents in professional volleyball teams, while at the same time gaining positive effects on professional volleyball teams.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 1997년도 추계 학술대회논문집
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• pp.38-42
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• 1997

A multiblock grid generation has been applied to a Navier-Stokes design procedure of a axial-flow compressors. A multiblock structure simplifies the creation of structured H-grids about complex turbomachinery geometries and facilitate the creation of a grid in the tip flow region. The numerical algorithm adopts the combination of the algebraic and elliptic method to create the internal grids efficiently and quickly. The input module is made of the results of the preliminary design, i.e., flow-path, aerodynamic conditions along the spanwise direction, and the blade profile data. The final grids generated from each module of the system are used as the preprocessor for the performance prediction of the sectional blade, the blade-stacking process and the three-dimensional flow simulation inside the blade passage. Application to the blade design of the LP compressor was demonstrated to be very reliable and practical in support of design activities. This customized system are coupled strongly with the design procedure of the turbomachinery cascades using the Navier-Stokes technique.

• 동력기계공학회지
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• 제2권1호
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• pp.39-44
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• 1998

Computational grids used in the numerical simulation of multi staged turbomachinery flow fields are generated. A multiblock structure simplifies the creation of structured H-grids about complex turbomachinery geometries and facilitate the creation of a grid for multi-row topologies. The numerical algorithm adopts the combination of the algebraic and elliptic method to create the internal grids efficiently and quickly. The input module is made of the results of the preliminary design, i.e., flow-path, aerodynamic conditions along the spanwise direction, and the blade profile data. The final grids generated from each module of the system are used as the preprocessor for the performance prediction of the single row cascades and the flow simulation inside the multi staegd blade passage. Application to low pressure compressor of industrial gas turbine engines was demonstrated to be very reliable and practical in support of design activities.

• 한국의상디자인학회지
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• 제21권3호
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• pp.25-35
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• 2019

The purpose of this study was to identify the relationships among credibility toward publicity (CP), the attitude toward publicity (AP), enterprise images, ethical obligations, and purchase intention, and then to demonstrate the differences in the relationships according to the three socially valuable creations: job creation, environmental protection, and fair trade. The hypotheses of this study were empirically tested with data collected via an online survey. The results of path analysis indicated that CP and AP positively affected enterprise images and ethical obligations respectively. Purchase intention was influenced by AP, enterprise images, and ethical obligations, but not by CP. In addition, this study highlighted the lack of a difference in consumer responses to publicity according to the three types of socially valuable creations. These findings provide guidelines for publicity strategies to induce consumers to purchase social enterprise products for marketing managers and entrepreneurs operating social enterprises.

• 항공우주기술
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• 제11권2호
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• pp.140-148
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• 2012

자율 주행을 위해 주행 지도, 위치 추적 및 목적지까지의 최단 경로 설정 연구가 필요하다. 특히 실내에서는 GPS 신호를 수신 받을 수 없기 때문에 이미지 프로세싱과 같은 방법을 통해 현재 위치를 인식하고 3차원 지도를 생성해야 한다. 본 논문에서는 Depth 카메라인 키넥트를 이용하여 3차원 지도를 생성하고, 일반 카메라로 촬영한 2차원 이미지를 이용하여 3차원 지도에서 현재 위치를 파악하는 방법에 대해 설명한다. 그리고 지도에서 장애물을 확인하고 단순화하는 방법에 대해서도 설명한다.

• 한국기계가공학회지
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• 제17권1호
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• pp.69-75
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• 2018

This study aims to provide ways to achieve structural improvements of the internal flow path of the discharge plenum of a swash plate piston pump valve block vulnerable to cracks. This paper corresponds to Part I, which consists of a structural analysis of the valve block, identification of the stress distribution and stress raisers, and creation of a Simple Model of the valve block to review the optimal design. Structural analysis was performed by assigning the same conditions as those found in the valve block model, and the design was reviewed by examining three different design improvement plans for the internal flow path of the discharge plenum.